port-name

Arguments:
dde-port

Returns the symbol that serves as the name of a DDE client-port. The
name may be useful for identifying the port programmatically, or
recognizing it when the object is printed or when it is mentioned in a
DDE message.

The name may be set either by passing the :name
initarg when calling make-instance to create a client-port,
or later by calling (setf port-name). Otherwise a gensymed name is used.